A pointe to the function which returns whether the first principal subsumes the second. Use NULL is not needed.

Description

JS_SetSecurityCallbacks sets the runtime's security callbacks to callbacks. It allows the embedding to control certain aspects of JS code execution based on security settings of the global object the code is executed in. If callbacks is NULL, it sets callbacks to default value.

JS_GetSecurityCallbacks returns the runtime's current security callbacks. If the callbacks are default value, it returns NULL